Learn HTML #34

Posted on by Apostube

HTML JavaScript

JavaScript makes HTML pages more dynamic and interactive.

Example

My First JavaScript

The HTML <script> Tag

The HTML <script> tag is used to define a client-side script (JavaScript).

The <script> element either contains script statements, or it points to an external script file through the src attribute.

Common uses for JavaScript are image manipulation, form validation, and dynamic changes of content.

To select an HTML element, JavaScript most often uses the document.getElementById() method.

This JavaScript example writes “Hello JavaScript!” into an HTML element with id=”demo”:

Example

<script>
document.getElementById("demo").innerHTML = "Hello JavaScript!";
</script>

Tip: You can learn much more about JavaScript in our JavaScript Tutorial.

A Taste of JavaScript

Here are some examples of what JavaScript can do:

Example

JavaScript can change content:

document.getElementById("demo").innerHTML = "Hello JavaScript!";

Example

JavaScript can change styles:

document.getElementById("demo").style.fontSize = "25px";
document.getElementById("demo").style.color = "red";
document.getElementById("demo").style.backgroundColor = "yellow";

Example

JavaScript can change attributes:

document.getElementById("image").src = "picture.gif";

The HTML <noscript> Tag

The HTML <noscript> tag defines an alternate content to be displayed to users that have disabled scripts in their browser or have a browser that doesn’t support scripts:

Example

<script>
document.getElementById("demo").innerHTML = "Hello JavaScript!";
</script>
<noscript>Sorry, your browser does not support JavaScript!</noscript>

Apostube

See author's posts

Related Posts

Learn HTML #50

HTML Uniform Resource Locators A URL is another word for a web address. A URL can be composed of words (e.g. […]

Learn HTML #49

HTML Plug-ins Plug-ins are computer programs that extend the standard functionality of the browser. Plug-ins Plug-ins were designed to be used […]

Learn HTML #48

HTML Audio The HTML <audio> element is used to play an audio file on a web page. The HTML <audio> Element To play […]

41 thoughts on “Learn HTML #34”

Leave a Reply

Your email address will not be published. Required fields are marked *